321243340987 has 2 divisors, whose sum is σ = 321243340988. Its totient is φ = 321243340986.

The previous prime is 321243340969. The next prime is 321243341063. The reversal of 321243340987 is 789043342123.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321243340987 is a prime.

It is not a weakly prime, because it can be changed into another prime (321243340937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160621670493 + 160621670494.

It is an arithmetic number, because the mean of its divisors is an integer number (160621670494).

Almost surely, 2^321243340987 is an apocalyptic number.

321243340987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321243340987 is an equidigital number, since it uses as much as digits as its factorization.

321243340987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 321243340987 in words is "three hundred twenty-one billion, two hundred forty-three million, three hundred forty thousand, nine hundred eighty-seven".